New car sales in the US posted the best month in more than four years, with Toyota Motor showing the biggest rise.
The car maker saw sales rise 42% in September.
Honda reported a jump of 31%, while Chrysler sales increased 12%. Analysts said buyers in the US were taking advantage of low interest rates and cheap financing.
The US car industry's recovery has been a boon to the economy in recent months.
Industry-wide sales were up 12.8% in September compared to a year earlier, to 1.19 million cars and light trucks.
Calculated on an annualized basis that is 14.94 million vehicles, the highest rate since March 2008.